Mainstream pop-rockers Kelly Clarkson, Sheryl Crow and Lenny Kravitz joined country stars including Taylor Swift, Carrie Underwood, Keith Urban and Blake Shelton at the CMA Music Festival in Nashville back in June. Even going up against all that star-power, though, breakout pop-country whippersnapper Hunter Hayes turned in a show-stealing performance. On Monday, ABC airs CMA Music Festival: Country's Night to Rock, featuring highlights from the event. In this exclusive clip from the special, watch Hayes and surprise guest Jason Mraz trade lines on the pair's bouncy toe-tapper "Everybody's Got Somebody But Me."

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